Quick Facts:
Singletons & Multiples

Pregnancy outcomes can vary for singleton and multiple births. Multiple births include twins, triplets and higher order births, and outcomes can vary among these groups as well.

In Boston in 2013, 95.8% of all live births were singleton births and 4.2% were multiple births.

Between 2003 and 2013, the multiple birth ratio in Boston increased nearly 13%.

Compared with singleton births (one baby), multiple births in Boston were about 7 times as likely to be preterm in 2013.

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